Wireless communication system working over Gamma shadowed Nakagami-m multipath fading channel in the presence of cochannel interference exposed to Nakagami-m short term fading and Gamma long term fading is investigated in this work. In interference limited channel, the ratio of desired signal envelope and interference is important performance measure. For considered model signal to interference...

In this paper, we consider the problem of spreading sequence optimization in a CDMA point-to-point transmission over a multipath fading channel. The aim of the sequence optimization is to construct a set of spreading sequences to support users in the system with the minimum total transmission power when the MMSE receiver is used for signal reception. We consider the sequence optimization for tw...

We introduce a new family of space–time trellis codes that space–time block codes as building blocks in our new trellis codes. These codes combine set partitioning and a super set of space–time block codes in a systematic way to provide full diversity and improved coding gain.. It is also possible to maintain a tradeoff between coding gain and rate.. Simulation result (i.e. frame error rate) sh...

To enhance the spectral efficiency and to improve service quality for cellular radio systems, a new microcellular system has been proposed [1-5] that operate over a relatively short radio path (on the order of 200 m to 1000 m), using relatively low antennas (about the same height as lamp posts), and transmitting at relatively low power (typically on the order of 10 m W). This new concept of mic...

Orthogonal Frequency Division Multiplexing (OFDM) has become a very popular method for high data rate wireless communications because of its advantages over single carrier modulation schemes on multi-path, frequency selective fading channels. However, inter-carrier interference due to Doppler frequency shifts, and multipath fading severely degrades the performance of OFDM systems. Estimation of...

Multiple-input multiple-output (MIMO) wireless communication system exploits the multiple spatial channels to achieve higher data rate or improved performance in multipath fading environment. Different types of diversity techniques such as temporal, frequency, code and spatial have been developed in the literature. In addition to the destructive multipath nature of wireless channels, frequency ...

The purpose of this study is to characterize the indoor channel for IEEE 802.16 (WiMAX) at 3.3 to 3.6 GHz frequency. This work presents a channel model based on measurements conducted in commonly found scenarios in buildings. These scenarios include closed corridor, wide corridor and semi open corridor. Path loss equations are determined using log-distance path loss model and a Rayleigh multipa...

In direct sequence-code division multiple accesses systems (DS-CDMA), the signals are transmitted over multipath channels that introduce fading. Multipath fading along with multiple access interference and intersymbol interference degrades the system performance. Further, simultaneous presence of multipath fading and shadowing leads to worsening of wireless channels. Moreover, experimental resu...

The multipath-rich wireless environment associated with typical wireless usage scenarios is characterized by a fading channel response that is timevarying, location-sensitive, and uniquely shared by a given transmitter-receiver pair.We review the PHYlayer security algorithms whose function is based on neural networks. Specifically, we studied a full key exchange scheme which includes channel sa...